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用电化学方法和扫描电镜对沉积晶体图象的观察,剖析了碳纤维微电极上汞膜的形成过程,提出了优化汞膜的实验条件;导出了碳纤维微汞膜电极上单扫描溶出电流方程式。通过搅拌和支持电解质对溶出峰电流影响的研究,提出了一个简化的分析手续,开发了CFME在ASV中的应用,Cu~(2+),Pb~(2+),In~(3+)和Cd~(2+)同时测定的检测限达3.0,0.6,1.2和0.5ppb,Zn~(2+)的检出限为1.3ppb。
The formation of mercury film on carbon fiber microelectrode was analyzed by electrochemical method and scanning electron microscope. The experimental conditions of mercury film optimization were proposed. The equation of single-sweep dissolution current on carbon fiber micro-mercury film electrode was derived. Through the research on the influence of stirring and supporting electrolyte on the dissolution peak current, a simplified analytical procedure was proposed and the application of CFME in ASV was developed. The effects of Cu 2+, Pb 2+, In 3+, The detection limits of Cd 2+ were 3.0, 0.6, 1.2 and 0.5 ppb, respectively. The detection limit of Zn 2+ was 1.3 ppb.